US3840238A - Sealing ring - Google Patents

Sealing ring Download PDF

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Publication number
US3840238A
US3840238A US00340691A US34069173A US3840238A US 3840238 A US3840238 A US 3840238A US 00340691 A US00340691 A US 00340691A US 34069173 A US34069173 A US 34069173A US 3840238 A US3840238 A US 3840238A
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United States
Prior art keywords
sealing ring
circumferentially
central portion
plane
set forth
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
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US00340691A
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English (en)
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H Sabet
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Individual
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Individual
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
    • F02F11/00—Arrangements of sealings in combustion engines 
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01C—ROTARY-PISTON OR OSCILLATING-PISTON MACHINES OR ENGINES
    • F01C1/00—Rotary-piston machines or engines
    • F01C1/02—Rotary-piston machines or engines of arcuate-engagement type, i.e. with circular translatory movement of co-operating members, each member having the same number of teeth or tooth-equivalents
    • F01C1/063—Rotary-piston machines or engines of arcuate-engagement type, i.e. with circular translatory movement of co-operating members, each member having the same number of teeth or tooth-equivalents with coaxially-mounted members having continuously-changing circumferential spacing between them
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
    • F03C—POSITIVE-DISPLACEMENT ENGINES DRIVEN BY LIQUIDS
    • F03C1/00—Reciprocating-piston liquid engines
    • F03C1/02—Reciprocating-piston liquid engines with multiple-cylinders, characterised by the number or arrangement of cylinders
    • F03C1/04—Reciprocating-piston liquid engines with multiple-cylinders, characterised by the number or arrangement of cylinders with cylinders in star or fan arrangement
    • F03C1/0403—Details, component parts specially adapted of such engines
    • F03C1/0415—Cylinders
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16J—PISTONS; CYLINDERS; SEALINGS
    • F16J9/00—Piston-rings, e.g. non-metallic piston-rings, seats therefor; Ring sealings of similar construction
    • F16J9/12—Details
    • F16J9/20—Rings with special cross-section; Oil-scraping rings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B53/00—Internal-combustion aspects of rotary-piston or oscillating-piston engines

Definitions

  • Ribs on the segments jointly constitute a ridge which extends in a substantially continuous loop about the axis of rotation and engages the inner casing face.
  • the ridge repeatedly intersects theaxially median plane of the sealing ring so that radial recesses in the ring circumferentially alternate with portions of the ridge, thereby providing access for lubricant to the interface of the ridge and the casing.
  • This invention relates to sealing rings, and particularly to a sealing ring suitable for sealing a cylindrical surface of the rotor in a rotary-piston, internalcombustion engine to the cylindrical inner face of the engine casing.
  • An engine of the afore-mentioned type requires an annular seal between respective cylindrical surfaces of the rotor and of the engine casing for preventing axial escape of hot combustion gases under high pressure from a chamber bounded by rotary pistons of the engine. Because of the thermal, mechanical, and chemical stresses under which the seal operates, it is neces sary for a long service life that it be lubricated. Lubrication is readily provided for the analogous piston rings of a reciprocating engine which axially sweep the cylinder wall. This is more difficult for an annular seal in a rotary piston engine whose axial position remains constant.
  • the sealing ring of the invention is constituted by a plurality of substantially identical, circumferentially elongated, separate segments which may be moved relative to each other for easy installation and removal.
  • the ring has an axially median plane perpendicular to the ring axis.
  • the segments carry respective radially projecting ribs which constitute a ridge elongated in a cylindrical surface about the ring axis in a substantially continuous loop.
  • the ring repeatedly intersects the aforementioned median plane, the number of intersections being equal to the number of segments times an integer.
  • Each rib has two longitudinal end portions, of which each is circumferentially coextensive with a corresponding end portion of a circumferentially adjacent segment.
  • FIG. 1 shows a rotor portion of the rotary-piston engine disclosed in said copending application, the rotor portion being equipped with a sealing ring of the invention and illustrated in a perspective view;
  • FIG. 2 shows the sealing ring in the apparatus of FIG. 1 in a greatly enlarged, fragmentary, developed view
  • FIGS. 3 and 4 respectively show the device of FIG. 2 in section on the lines 3--3 and 4-4;
  • FIG. 5 illustrates a modification of the device of FIG. 2 in a corresponding view
  • FIG. 6 and 7 respectively show thedevice of FIG. 5 in section on the lines 6-6 and 7-7.
  • FIG. 1 there is seen one of'the two rotor elements employed in the internal-combustion engine of the earlier application. It mainly consists of a unitary piece of metal providing a flat, centrally apertured, cylindrical disc 3 from which four identical pistons 4, 5, 6, 7 project axially in circumferentially spaced relationship.
  • the pressure of an exploding fuel mixture in a chamber bounded circumferentially by one of the pistons 4, 5, 6, 7 and by a piston of the non-illustrated other rotor element causes the one piston to turn the disc 3 about its axis in a non'illustrated engine casing which has a coaxial, inner wall of circular cross section about the disc 3.
  • the rotor element must be sealed to the cylinder wall.
  • a sealing ring having segments 1, 1' visible in FIG. 1 seals the cylindrical circumference of the disc 3 to the cylinder wall, and other sealing elements 8,9 similarly seal each of the pistons 4,5,6,7.
  • This invention is particularly concerned with the sealing ring on the disc 3 whose segmentsare partly recessed in a circumferential groove of the disc, as is conventional and not shown in detail.
  • the sealing ring consists of three identical segments 1, 1', 1" which jointly extend over the entire circumference of the disc 3 and are partly recessed in the groove of the latter.
  • Each segment is a unitary piece of heat-resistant, somewhat flexible composition .not itself relevant tothis invention.
  • Its inner face, as is partly seen in FIGS.3 and 4 is cylindrical and of uniform axial height.
  • the central rib portion 11 is elongated obliquely relativeto the axially median plane of the sealing ring, and intersects the median plane at a small, acute angle.
  • the circumferentially terminal rib portions 12,13 are each approximately L-shaped.
  • the shorter leg of each L-shape is integral with an associated end of the central rib portion 11 and is axially elongated.
  • the longer legof each L-shape 12,13 is circumferentially elongated and circumferentially bounds one of the recesses 15,16 which are open in a radially outward direction and in respective axial directions.
  • Each recess 17 is bounded by the two legs of a terminal rib portion 12,13 and receives a terminal rib portion of a circumferentially adjacent segment.
  • terminal rib portions 12,13 of two circumferentially adjacent segments are thus axially juxtaposed in circumferentially coextensive or'overlapping relationship.
  • the terminal portion of the segment 1 and the longer leg of the ribportion 13 on the segment 1" jointly define a rectangle in axial section.
  • the terminal portion of the segment 1 is bounded by each of the four sides of the rectangle,
  • the central rib portions 11 and the terminal rib portions 12,13 of the segments l,1,1"' jointly constitute a ridge which extends about the ring axis in a common cylindrical surface for engagement with the nonillustrated, inner, cylindrical face of the engine casing.
  • the ridge forms a practically continuous loop which intersects the median plane of the ring in the center of each central rib section 11, and in each shorter leg of a terminal rib portion 12,13, thus intersecting the median plane three times in each segment, and altogether nine times.
  • the recesses 15,16,17 circumferentially alternate with portions of the ridge 11,12,13. During relative rotation of the rotor element illustrated in FIG. 1 and the non-illustrated engine casing, the recesses 15,16,17 permit lubricant to reach the interface of the composite ridge 11,12,13 and of the inner engine casing wall.
  • the several segments 1, 1',1" may be held in the annular groove of the disc 3 by being resiliently compressed between the radial groove walls, but the nonillustrated engine casing prevents their escape from the groove in a radially outward direction. Circumferential movement of the sealing ring in the groove of the disc 3 is adequately prevented by short cylindrical pins 14 which project from the disc 3 into respective, conforming, semi-cylindrical notches in the segments 1,l,1".
  • the notches are open in an axial and a radially inward direction, that is, away from the rib of the segment, but may also pass through the entire segment, as is shown in FIG. 2.
  • the several segments 1, 1', l are sufficiently secured to the disc 3 to permit the sealing ring to be installed on the disc prior to assembly of the latter with the engine casing, yet, they may be removed readily with the simplest of tools because they are capable of relative movement from the operative position shown in the drawing. No tools are needed for installing new ring segments. Installation is further facilitated by the fact that the several segments 1,.l',1" are identical in shape and size.
  • the relationship between the circumferential length of the central rib portion 11 and the combined circumferential length of the terminal rib portions 12,13 on each ring segment may be chosen to fit specific conditions.
  • the central rib portions 21,2l',2l" are elongated circumferentially in a radial plane on one side of the axially median plane of the ring, and the corresponding central rib portions of the two adjacent ring segments are located on the opposite side of the median plane.
  • the modified ring illustrated in FIG. 5 thus must have an even number of identical segments, preferably two or at most four.
  • Theterminal rib portions 22,22",23,23 are L-shaped as described with reference to the corresponding elements 12,13 in FIGS. 2 to 4, and radially extend over the full thickness of the ring.
  • a very narrow, S-shaped gap is thus formed between the terminal rib portions of circumferentially adjacent segments, but is sealed practically heremetically by the pressure differential between the two spaces axially separated by the sealing ring, the width of the gap being exaggerated in FIG. 5 for the sake of convenient pictorialrepresentation, and more realistically represented in the sectional view of FIG. 6.
  • Round pins 24 project from the disc 3 into respective hemicylindrical notches of the ring segments for circumferentially securing each ring segment in the groove of the disc 3.
  • one pin 24 engaging only one segment may often be adequate.
  • a long, straight groove 25 of one ring segment 2, coextensive with the central rib portion 21, alternates circumferentially with the long leg of the associated L-shaped rib portion 23, the short leg of the associated L-shaped rib portion 22, the long leg of the rib portion 22" on a circumferentially associated segment, and the central rib portion 21.” of the latter on the same side of the axially median ring plane, thereby permitting adequate lubri-.
  • the recesses 15,16,25 need only be relatively shallow.
  • the recesses 17 shown in FIG. 2 have a depth equal to one half the maximum radial thickness of the ring shown in FIGS. 2 to 4, and the corresponding recesses in the ring of FIGS. 5 to 7 extend through the entire thickness of the sealing ring.
  • the L-shaped rib portions 12,13 may be interchanged with the rib portions 22,23 for producing modified end seals between the ring segments of the two illustrated embodiments.
  • a sealing ring having an axis and being constituted by a plurality of substantially identical, circumferentially elongated, separate segments movable relative to each other, said ring having an axially median plane, said segments including respective radially projecting ribs, said ribs jointly constituting a ridge elongated in a cylindrical surface about said axis in a substantially continuous loop and repeatedly intersecting said median plane, the number of intersections of said ridge and of said plane being an integral multiple of the number of said segments, each rib having two longitudinal end portions, each end portion being circumferentially coextensive with a corresponding end portion of a circumferentially adjacent segment.
  • each of said ribs has a central portion intermediate said end. portions, said central portion obliquely intersecting said plane.
  • each segment has a central portion, each end portion being approximately L-shaped and including an axially elongated leg part and a circumferentially elongated leg part, said central portion integrally connecting the axially elongated leg parts of said two end portions and bounding an axially and radially open recess in said segment.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Pistons, Piston Rings, And Cylinders (AREA)
  • Sealing Devices (AREA)
US00340691A 1972-03-20 1973-03-13 Sealing ring Expired - Lifetime US3840238A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2213343A DE2213343C3 (de) 1972-03-20 1972-03-20 Dichtung zwischen zwei zylindrisch ineinander angeordneten, relativ zueinander rotierenden Maschinenteilen

Publications (1)

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US3840238A true US3840238A (en) 1974-10-08

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Family Applications (1)

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US00340691A Expired - Lifetime US3840238A (en) 1972-03-20 1973-03-13 Sealing ring

Country Status (7)

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US (1) US3840238A (ja)
JP (1) JPS549245B2 (ja)
DD (1) DD103493A5 (ja)
DE (1) DE2213343C3 (ja)
FR (1) FR2177351A5 (ja)
GB (1) GB1421864A (ja)
IT (1) IT979554B (ja)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3938478A (en) * 1974-04-29 1976-02-17 Piper Jack N Rotary internal combustion engine

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4994211U (ja) * 1972-12-07 1974-08-14
JPS6065378A (ja) * 1983-09-19 1985-04-15 Kishiyouhin Kagaku Kaihou Kenkyusho:Kk 皮丘面積の測定方法及び装置

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3938478A (en) * 1974-04-29 1976-02-17 Piper Jack N Rotary internal combustion engine

Also Published As

Publication number Publication date
JPS4912254A (ja) 1974-02-02
DE2213343C3 (de) 1975-09-25
DD103493A5 (ja) 1974-01-20
FR2177351A5 (ja) 1973-11-02
DE2213343A1 (de) 1973-10-11
JPS549245B2 (ja) 1979-04-23
IT979554B (it) 1974-09-30
GB1421864A (en) 1976-01-21
DE2213343B2 (de) 1975-02-20

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